Grinding machine



July 18, 1933. G w BINNS 1,919,143

GRINDING MACHINE Filed Sept. 1930 2 Sheets-$heet l All I:

l I IH.

A TTORNEY y 18, 1933- G. w. BINNS 1,919,143

' GRINDING MACHINE Filed Sept. 1930 2 Sheets-Sheet 2 Patented" July 18, 1933 N T STATESPATENT enononw. BIN NsQor cINoI NA'rLoIIIo, assifeNoa'ro CINCINNATI GRINDERS moon 1 1 PoRArEn, OFCINCINNATI, HI0,-A CORPORATION or o-HIo 1 GRINDING MACHINE 1 Application filed September 2, 1930. Serial No. 479,237;

Thisinvention relates to improvements in machine tools and especially to improvements in centerless grinding machines.

An object of the invention is the provision of improved means forpositioning a work piece relativ'e'to the throat of a centerless grinder. 1

1 Another object of the invention is the provision of an improved hydraulic or pneumatic work ejecting 'mechanism utilizable with. a

fixed or immovable stop mechanism thereby insuring proper positioning of work relative to the grinding wheels of a centerless grinder and this mechanism is especially advantageous .for the tooling of formed or tapered work pieces, such as the'valve seats of mush room type valves, taper bearingirolls, and such like articles.

An additional object of the invention is the provision of such a positioning and ejecting mechanism which, when utilized while Inachining or finishing as above noted formed or tapered work will bear against the work ata point as closely as possible coincident with the axis of rotationthereof so thatno interference to the rotation'of the work is offered by the saidpositioning :or stop member.

Other objects and advantages of'the present invention should be readily understood by 1 reference to the following specification considcred in conjunction with the accompanying drawings and itis to be'understood that i any modifications may be made within the" exact structural details there shownand described within the scope of the appended claims without departing from ore-Xceeding the spirit of the invention.

Inthe drawings: 1 v Figure 1' is a front elevational view of a grinding machine embodying the'improvemerits of this invention. 1 Figure 2 is a top plan view of the machine shown in Figure l. V 1

Figure 3 is a sectional View taken on line 3-3 of Figure 1.

Figure 4 is a sectional view taken tially 011 line 44 of FigureQ.

Figure 5 is a sectional view taken'substantially onlinc 55 of Figure 2. I 1

substan- F igure-6 is a fragmentary sectional View I takenon line166.of- Figure 4.

' Figure 7 is an end View partly in section of I the machine-shown in Figure l-illustrating a V modification of the invention. t I j Figure 8 is a modified form of the lnvention. V

Throughoutthe several ,views of the drawings similar-reference" characters are em- 1 ployed to denote the same or similar parts.

In the use-of centerless grinders there are two methods generally employed known as the through-feed and in-feed methods. the former method the work is introduced into the grinding throat of acenterless grinder atone side thereof and fed axially through v the said throat to be discharged on the other side thereof while in the 'in-feed method the grinding throat is'enlarged to permit themsertion of work therein, "the throat is then contracted to reducetheTyvork to the desired size and form and subsequently enlar' ed permitting removal of the work from t e same side of the throat "as it"wasintroduced. This invention pertains primarily to the in-tfeed with thethrough-feed method; Inthe past,

the normal'stop'means forpositioning the work in 'the'grinding throat relative. to the method of grinding although it maybe used 1 ing member. It has been foundthatfor cer- 3 tain types of work an absolutely rigid end stop is desirable which should bear against the work very" close to its center of rotation. These advantages are realized by the use of the device of this invention illustrated in the drawings and such a device mayfcomprisea bed 10 having rotatably mountedat one end thereofa grinding wheel 11 rotatable at a high orgrinding rate of speed in a clock- I wise direction'as indicated by the arrow on its housing. Opposed to the grinding wheel 11 and movably supported by the bed 10 is aregulating wheel 12 likewise rotatable in a clockwise direction but at a relativelyslow, work-controlling rate of speed. The regu- 1 latingwheel '12'is supported for rotation by a slide or housing 13 forming a part of the regulating wheel unit and supported on'-suitable, ways for movement therealong by the lower slide 14. This slide is in turn guided on ways formed on the upper surface of the bed 10. The opposed active faces of the grinding and regulating wheels are adapted to be spaced from one-another to form a grinding throat in whichthe work 16 is mounted for operation thereon. The said work 16 is supported by a work rest blade 17 having active angled top 18 inclining toward the face of the regulating wheel 12 and forming a work receivinig trough therewith. The blade 17 is supported by a work rest block 19 carried by the inner. end. of the lower slide 14. I

The lower slide 14 is adapted to be translated along thebed 10 for adjusting the work rest block 19 relative to the grinding throat for 'initiallysetting-up the machine while theregulating wheel unit 13 is movable longitudinally ofthe said lower slide for'feedin'g. the work carried by the blade 17 into the grinding Wheel to efiect a stock removal therefrom. The said .slideslare furtheradapted to be moved as a unit relative to the bed 10 especially when setting-up the grinding throat.

for which purpose clamp 20 is provided for securing the said slides to one another while to permit independent movement of the regulating wheel unit c1amps'21 are employed for locking the lower slide to the bed. 10. An adjusting screw 22 is employed for actuating the slides and has its threaded-end received in a nut 23, see Figure -5,-,ca rri ed by the reg ulatingwheel unit 13 and-held against translating movement relative thereto by collars or the like 24. A pilot: or hand wheel 25 is mounted on the outer end of the adjusting screw 22 for actuating-same.

Asshownin Figures 1, 2, 4 and 5, the upper slide 13, in actual operation; is automatically moved through a definite zone by the in-feed" mechanism enclosed within housing 26 secured to the bed 10.

operativ'ely coupled with worm '29.. Secured to the wormlshafttat its outer end thereof is agear 30 connected to change gears 31 w th a fi' in a roller 35 carried by adjustable block36 on the lowerend of arm 37. The arm 37 is pivoted at 38 to the walls of the housing 26 and has extending therefrom lugs 39. Links 40have onevof their ends pivoted to the lugs 3' 39 and their other end to a slide block 41 slidable in a bearing 42 of the housing 26. r The slide block 41- surrounds the adjusting screw 22 and is secured in position thereon by .collars .43 and 44.

From the foregoing: it will be noted that A wormshaft 27 is rotatably journaled 1n the housmg 26 and has'keyed-to its one end a worm wheel 23 I the cam groove 34 oscillates the arm 37 about its pivot for axially shifting the screw 22- 34a of the groove-is employed.

Supported by the work rest block 19 at the rear end of the grinding throat is a bracket 45 having a threaded bore 46 therein aligning with the grinding throat and receivinga positioning member 47. The said positioning member is provided witha central bore 48 and a threaded shank 49 for lock nut 50.

for positively locking the positioning member 47 relative to the bracket 45. The lower end of the bracket 45 is providedwith an elongated opening 51 for bolt 52 which eX- tends therethrough into the workirest block 19. The elongated opening 51 permits vertical adjustment of the bracket 45 relative to the block 19 whereby the threaded'bore 46 therein may be properly aligned with the grinding throat. i The bracket 45is further provided with a reduced threaded bore 53 (Jo-axial with bore 46 and receiving pipe or hose coupling 54'from which air pipe'or'conduit 55 extends. a

The said conduit 55 extends to one end. of the machine where it is coupled with valve block 56 secured to the housing 26. i The said valve block 56 encloses a conical valve 57 iaving a spring 58 engaging its one 'end' and normally hold ngit against its seat 59. A rod 6O abuts on one end w1th the other side of the valve being-guided through gland 61. The other end of the rod 60 abuts an arm 62 fast onthe end of rock shaft 63. As shown iii-Figure 4, the rock shaft 63 is oscillatably j ournaled in the walls of the housing 26 and has secured to it'intermediate its ends an arm 64 carrying roller 65 which rides on the periphery 6605f the cam 33 for? engagement with cam lug'67 formed on the said periphery 66. A pressure conduit or line 68 is'also connected with the valve block 56 being'closed off byvthe' valve 57. The r-elation of cam lug 67 and portion 34a of the cam groove 34 is such thatthe regulaing wheel is first retracted, from the grinding wheelfor opening the throat thereof where. upon the cam lug 67 engages rollerv 65 for oscillating the arm 63 and opening the valve 57 to connect pressure c'onduit68 .with the conduit 55 causing a blast of air to flow through the bore 48 ofthe positioning member 47 for ejecting a piece of work from the grinding throat. As soon as the cam lug 67 passes from under the roller .65 the spring 58 expandsand returns the valve 57 to its seat cutting off further flow of the compressed air through the conduit so that an'additional work piece may be "positioned Ewithin the grinding throat. f v

The modified workpositioning and ejecting structure shown in F igure, 8 is particularly useful in the grinding of formed work pieces, and s shownfis utilized for positioning a tapered bearing roll. The said mechanism comprises 'anradjustable bracket or supporting member 45a having a threaded bore 80 receiving thethreaded shank of end stop or positioning member 81. H The bracket 45a is further provided with an enlarged aperture 82th'rough which the reduced abutting portion 83 ofthe stop member 81 exten'ds. This reduced portion 83 terminates in a nose 84 abutting the rear end of the work or tapered bearing roll 85. The walls of the bracket member 4.5a-are spaced from the surface of the abutting portion 8384 to provide a passage and form a nozzle for the hydraulic medium, such, as-compressed air, for directing same against the end of the work. The hydraulic pressure medium orair is introduced into the chamber 82 through a suitable conduit orhose 55a.

mal to the axis of rotation and it will be noted that suflicient surfaceofthe work is exposed to the action of the hydraulicmedium or air blast. y r

The modification, shown in Figure 7, is of a semi-automatic nature in that the regulating Wheel is actuated toward and from the grindingewheel manually while the valve for operating the compressed air ejector-is I opened automatically at the end of the retracting movement of the regulatinglwheel by the said lever. This mechanism includes the manually shiftable lever secured through split clamp 71, at the lowergend thereof, to the nut 23 which is oscillatably.

mounted in the regulating wheel unit or slide 13. The saidlever 70 isnormally in the position shown in dottedlines at 72 at which time the grinding throatisenlarged'for the 1 reception'of an unfinished ,work piece. A

valve housing 73 is secured to the rear wall of the regulating wheel unit-13 and has extending therefrom a valve'plunger 74 for valve 75 held againstjits seatby a spring 76.

An additional spring 77 surroundsthe plunger 74 for normally holding the valve 75 closed and preventing flow ofthe compressed air from conduit 68-to conduit 55, For actuating the valve plunger 7 4 there is provided for movement with the lever ,70- a trigger "member 78 adapted to; engage the head of the plunger 74.

i .The operation of the devicetdisclosed in Figure 7 is as follows: 1With the hand lever I in the position shown by the dotted lines 72 a workpiece is placed upon the work rest blade 17 whereupon the lever 7 O is. actuated i in a counterclockwise direction feeding the regulating 'wheel unit 13 and. regulating.

wheel 12 toward the grinding wheel. The movement of the lever '7 0: is substantially through an arc of pause is effected for permitting the sparking out of the. grinding wheel whereupon the lever is reversely. actuated or moved in a clockwise dII'BCtIOIL' Tfhis movement'continues to and beyond the dotted line position for causing the trigger member 78 to engage atwhich time a slight and depress the plunger 7 4 openingthe valve 1 and connecting'the conduits68 and 55. .At

this time the grinding throat is completely expanded and the sudden blast of compressed airejectsthe work from the grinding throat.

The lever may then'be returned toits nor v mal dotted line position permitting springs 77 and 76 to expandand close the valve or the manual force against-the lever may be removed after opening the valve and permit the lever to be returnedto its normal position by the said springs.

What is claimed is: 1 In a device of the class described the n combination with a bed,of a pair of'oppos'ed grinding and regulating wheels carried th ereby and forming a grinding throat therebetween, a' work rest blade within the throat for supporting work in engagement with the wheels, a fixed stop 'member adjacent the work rest for positioning a work piece on the Work rest relative to the wheels, the saidfixed stop member having an axial opening therethrough, a pneumatic pressure source, and means connecting the pneumatic pressure I source with the stop member whereby the said pneumatic pressure source is directed against the, end ofthew'orkconta-ctingthe fixed stop" forejecting same from the work i a rest blade. M i

2. In a device oftheflclass described the combination with a pair of opposed grinding and-regulating wheels formmg-agrinding throattherebetween, of a; work support with;

in the throat for supporting awork piece,

a source of hydraulic pressure, a hollowfixed I .120 1 the work-rest blade to position saidwork relar tiveto the blade and connected with the pressure source for directing same against the stop member for abutment withqtheiwork on workito eject the workfrom the grinding throatpand means intermittently actuable for, controlling theflow from the pressure source ,to; afterthe grinding operation. .1 i

3., In a device of the class described the combination with a pair of opposed grinding ject the work from 'its support i and regu latin'g wheels forming a grinding" throat therebetween, of a work support with in the threat for supporting a workpiece,

asource of hydraulic pressure, a hollow fixed stop member for abutment with the work on the work rest blade to position said work relativeto the blade and connected with the pressure source for directing same against the work toej eat the work from the grinding throat, means controlling the flow of the pressure source, means for actuating one of'the wheels toward the other to feed the work into thegrinding Wheel, and means operable withthe work. feeding means for actuating the pressure flow control means.

4. Ina device of the class described the combination of'a' work support for peripherally'supportinga workpiece, a bracket adacent said support, a hollow positioning member carried bythe bracket for abutment with the work to position the work relative to the work support, andan hydraulic'pressure source, in the nature of a gas, coupled with the hollow work positioning member and directed thereby against the work'for axially ejecting the Work from the support] 2 5; In a device of the class described the combination of a work support for peripherallysupporting a work piece, a bracket ad'- jacent said support, a hollow. positioning.

member carried by the bracket'for abutment with the work to position the work relative to the Worksupport, an hydraulic-pressure source coupled with the hollow workpositioning member and directed thereby against the work for ejecting the work from the sup} port, a grinding wheel for operation on the workto effect a stock removal therefrom,

means for feeding the work into the grind ing wheel, and means operable by said work feeding means for controlling the flow of the 6. In a devicelofthe class describedthe combination of a bed, a grinding wheel rotatably carried thereby, 'a'slide, translatably carried by the bed formovement toward and from the grinding wheel, a work rotation controlling member carried by the slide for movement therewith, means between the active fa'ces of the wheels for supporting'a work piece during the grinding operation, means for abutting the work to restrain the work against axial movement during'th'e grinding operation, means for translating the slide and regulating wheel toward the grinding wheel'includin-g'a cam, means for directing a blast of compressed air against thework for actuating said work relative to the support to eject same from the'grinding'throat,"and means controlling the flow of'sa id compressed air operable by thecam;

' 7. In a device of the class described the combination of a pairof opposed grinding and regulating wheels forming a grinding throat therebetween, a work support within the grinding throat, means for actuating one of the wheels towardthe other to feed the work into the grinding wheel efiect a stock removal therefrom 'including' a manually actuable lever, means for directing'a blast of compressed air against the work for ejecting same from the blade, (1 means 0perable by the lever for control ing the flow of the said compressedair'.-- i

8. In device'of the class describedthe combination" with a workisupport for p'e ripheralengagement with the work, a bracket acent the support having a threaded bore aligned with the work, a positioning nozzle having a -threaded' shank received in the threaded bore of the bracket and abutting the work-to position same relative to thesupport, means for locking the positioningnozlie in its adjusted position, and an hydraulic pressure source terminating at the bracket and directed by the positioning nozzle agains the workto eject said work-from its support.

In a device of the'class described the 10. In a device of the class'describe'd the combination with the throat of a centerless grinder including means therein for peripherally supporting a work piece, of means for positioning the work relative tothe supporting means and grinding throat and for ejecting same therefrom comprising a supporting bracket, an immovable abutment member carried by said bracket contacting withthe work at a point substantially coincident with the axis'of'rotation thereof, and means for directing a'blast of air against the work to eject-.same-from' the grinding throat;

11. In a deviceof the class described the combination with the throat of'a centerless grinder including means therein for-peripn erally supporting a work piece, of means for positioning the work relativeto the supporting means andgrinding throat and for ej ecting same therefrom comp-risinga supporting bracket, an immovable abutment member carriedby said bracket contacting with the i work at a point substantially coincident with the aXis of rotationthereofi'means for directing a" blast of air'aga'inst the work to eject same from the grinding throat, said means comprising a chamber formed in the bracket surrounding thepositioning member, and

means for supplying'the"compressed air'gto the chamber; I I

12. In a devicecof the'cl'ass'desoribed the means for supplying thecompressedair to the chamber, and means for adjustably looking the abutment member in adjusted position relative to the bracket.

13. In a device of the class described the combination with the throat of a centerless erally, supporting awork piece, of means for positioning the work relative to the supporting means and grinding throat and for ejecting same therefrom comprising a support- 'ing bracket, an immovable abutment member carried by saidbracket contacting with the work at: a point substantially coincident with the axis ofrotation thereof, means for directinga blast ofair against the work to eject same from the grinding throat, said vmeans comprising a chamber 1 formed in the bracket surrounding the positioning member,

grinderincluding means therein for periphmeans for supplying the compressed air to" the chamber, and means controlling the flow of the compressed airto the chamber whereby a blast thereof is directed against the work only at the completion of the grinding operation. I a

GEQRGE' W. BINNSQ 

